Leases - Summary of Company's Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Feb. 29, 2016
Assets
Operating lease assets	$ 62,466	$ 20,757	$ 5,580	$ 5,580
Liabilities
Current portion of operating lease liabilities	1,909	972
Noncurrent portion of operating lease liabilities	51,545	20,976
Total lease liabilities	$ 53,454	$ 21,948	$ 5,897	$ 5,897